Improvement in dental pluggers



R B. DONALDSON. DENTAL-PLUGGER..

Patented July 3,1877;

N- PETERS. PHOTO-LITHDGHPH UNITED STATES.

PATENT OFFICE.

ROBERT B. DONALDSON, OF WASHINGTON, DISTRICT OF COLUMBIA.

IMPROVEMENT IN DENTAL PLUGGERS.

Specification forming part of Letters Patent No. 192,746, dated July 3,1877; applieationled June l, 1877.

Te all 'whom it may concern Be it known that I, ROBERT B. DONALDSON, ofWashington, District of Columbia, have invented certain new and usefulImprovements in Dental Pluggers; and I do ,hereby declare thatthefollowing is a full, clear, and exact description thereof, `which willenable others skilled in the art to `which'itappertains to make and usethe same, reference being had to theaccompanying drawings, and to theletters of reference marked thereon, which form a part of thisspecification, and in which- Figure 1 is a side elevation of my improveddental plugger. Fig. 2 is a plan view thereof. Fig. 3 is a verticalsection through the dotted line .fr a' of Fig. 1 and Fig. et is anenlarged detached view, in side elevation, of the retaining device fordetachably securing the plu gger or other instrument in the stock ortube.

Corresponding parts in the several iigures are denoted by like letters.

This invention relates to certain improvements in dental pluggers; andit consists, first, of a retaining device for manipulating anddetachably securing the tool or instrument; secondly, of mechanism forobtaining `a uniform and steady blow; and, thirdly, of the same forregulating the force of the blow, substantially as hereinafter morefully set forth and claimed.

In the annexed drawing, A refers to the stock or tube which receives thetool, or plugger, or other dental instrument, passingentirely throughsaid stock and beyond it, contiguous to the external hammer, by which,itwill be seen, that the blow is brought directly upon the tool itself,which isinserted in its stock so as to have an independent motion, ashereinafter described, and thus avoid the necessity of having to operatethe tool by vibrating the stock by hand.

By means of my device the hammer can be operated without thus vibratingthe stock, and its number of blows in a given time can be increased ordiminished. For convenience in introducing the spring and retainingdevice, to be hereinafter referred to, the stock or tube is made in twoparts, a a', one having a screw entering a female screw in the other toldetach ably connect them together.

The internal circumference of the part a.' is

connected to the latter, as presently described. The tube b is providedupon one side with a l slot, b, for the reception, and to permit of atooth or detent of a lever-spring, d, projecting into the tube or stockA. The lever-spring d is inserted and fastened in a'taperiug recessV inthe tube b, sloping toward and terminating in the slot b', as seen inFig. 3.

It will be observed that, -upon the insertion into the stock or tube Aof the instrument, which should irst be notched or recessed, the detentor tooth of the lever-spring d will spring into the notch or recess ofthe instrument, and

vthus retain or secure it in place ready for use.

The instrument can be as readily detached by vsimply lifting the detentor tooth ofthe leverspring d out of its notch.

The tube b is next rotated, the stock or tube A being cut away orprovided with an opening, e, through which the tube b may be reacheduntil the lever-spring d, having the detent or tooth, is concealed orbrought opposite the wall of the stock or tube A, when the detent ortooth of said lever-spring will be prevented from becoming disengagedfrom the instrument, it having thus been locked therein. To assist therotation of the inner tube l) by the hand it maybe roughened or milled,as seen in Fig. l.

The primary object of the inner rotary tube `b is, it will be seen, byvibrating the same with the thumb, to manipulate the tool or instrument.

B is a case or support, attached at one end to the upper end of thestock or tube A, and having its other end more or less elevated. C isthe mallet or hammer, disposed external to the stock and directly overthe upper end of the plugger or instrument, and provided with aspring-lever,f, preferably curved and fulcrumed in the distant end ofthecase or support B, at f its free end having a lateral projectiom g,yagainst the lower sideof which bears the-free endl of acurved or othershaped spring, h, fastened to the case B. This spring is caused to bearwith greater or less pressure upon the mallet or hammer lever f, inorder to regulate the force of its blow, by means of tension mechanism,consisting, in. this instance, offthefol'- lowing parts is a plate orbar, arranged upon the lower side of the cas@ B, about midway throughwhich plate oryba'r passes a thumbscrew, il, entering the said case. Theinner end of the plate or bari also enters the said case, while itsouter end is provided with an upright stud or projection, t2, bearingagainst the spring h.

It is fully apparent that other means may bedevised=qually adapted'forregulating the tension ofL the spring h.` The hammer or mallet- U isvibrated by a cam, j, upon an axis bearing in the case 13, whichstrikesa pendant or projection, 717 depending from the hammer or mallet leverf.- Disposed' upon ,the saine axis with the cam j lis a pinionor cog',l, gearing with a second pinion'or cog, m, having its axis n bearingin4the case B, and'extending. beyond-the case forattachment to` anysuita-y ble motor. Through this intermediate gearingit will beobserved-that a steady andu nient, is-

1. InlI a44 dental, plu gger, the retaining device havingthelever-springd, provided with a detent or tooth, substantially as andfor the purpose set forth.

3. The tube b, resting upon and in combination with the springt);stock'A,and leverspring d, having 'a detent or tooth, substantially asand for the purpose set forth.

4. The mallet or hammer G, having a 1ever, f, provided withvalateralprojection, gl', in co m' verhavingka pendant,`in combinationwith the cam j andgearingljm, substantially as andi for the purpose setforth.

In testimony that I claim the foregoing as I ymy own I hereunto affix mysignaturein, presrence ofjtwo Witnesses.

n. B.; DQMLDSQN: Witnesses r H. G. THOMPSON, Hf. ScHooLEX,

